1. History of the Carbon Cycle

3. Carbon Cycle
A biogeochemical cycle by which carbon is exchanged among the biotic and abiotic factors of the Earth.
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4. Plant Cell Review
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5. Organelles
Mitochondrion: breaks down organic molecules in the presence of oxygen to create energy for the cell (cellular respiration)

6. Chloroplast: Stores energy in the form of organic molecules from carbon dioxide and releases oxygen by using sunlight (photosynthesis)
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7. Endosymbiotic theory: a host cell engulfed prokaryotic cells capable of photosynthesis and cellular respiration
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8. Which organelle and their process came first?

9. Evidence of Oxygen in the Atmosphere
Cyanobacteria: bacteria that get their energy through photosynthesis and are the only photosynthetic prokaryotes able to produce oxygen.

10. Stromatolites: originally formed by the growth of layer upon layer of cyanobacteria
These growths primarily contributed to the formation of oxygen of earth's atmosphere
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11. The oxygen produced from the cyanobacteria was used to make rust (iron + oxygen)
Rust in rock layers begins to form about billion years ago (bya)
This is after the first stromatolite fossil appears in our fossil record (3.7 bya)